What determines how much volt and current (ampere) is present in the salt water battery? Decide your independent variable.
[our independent variable is = 'the temperature of the salt water']
We decided to change the temperature of the salt water and observe the difference in temp according to the time variation.
Ⅱ. Hypothesis
"If the temperature of water goes up, then the volt and the current from the salt water battery will also increase"
Reason: When the temperature of the salt water increases, the electrons will be able to move in a faster speed, which will eventually give out more energy.
Ⅲ. Materials
1. 200ml of water
2. 10g of salt (Sodium Nitrate; NaNO3)
3. One pair of electrode: 5cm * 5cm, copper & iron
4. 1 plastic cup
5. 1 beaker
6. 2 pieces of wires
5. Electronic balance
6. Heater
7. Thermometer
8. Ampere/ Voltameter
10. Metal stand and clamps.
Ⅳ. Procedure
1. Put 10g of salt into the plastic cup with 200 ml of water.
2. Stir the water until the salt is completely dissolved in the water.
3. Pour the salt solution into a beaker and set up the "battery."
4. Connect the wires from the electrodes to the ampere/voltameter.
5. Place the thermometer in the solution to observe the tempearture, and hold it with metal stand and clamps.
6. Change the temperature by using the heater
[By 5 degrees Celcius, ex) 30, 35, 40, 45, 50, 55, 60]
7. Record the observations, as the temperature increases.
[Look out for the change in both Volt and Ampere.]
8. Evaluate - draw tables, graphs, and idea to organize your observations.
Ⅴ. Graph & Table
Temp (C)
30
35
40
45
50
55
60
Volts (V, 20) +/- 0.04
0.41
0.40
0.38
0.35
0.33
0.32
0.29
Amp. (A, 20m)+/-0.1
6.21
5.12
5.22
5.38
5.45
5.54
4.60
Ⅵ. Evaluation
The data was surprisinngly, completely opposite to the result which we have expected during making hypothesis. We thought the voltage and ampere will increase if the temperature increases, but both voltage and ampere had rather been decreased. Even though we made some mistakes in keeping the position of the electrodes the same, but the result was okay. The strength of our method is that we actually can use the easiest method, which is just heating the beaker and waiting, in order to get a comparatively significant changes in voltage and ampere. However, the weakness of our method is that we are not able to observe the exact results because it is not able to measure the y values in exact x values. In words, the exact values of electricity are not able to be observed in exact temperature.
We can conclude from our results that if the temperature goes up, the voltage and ampere rather go down. We want to recommand the people who want to reproduce the battery should keep it in a cool place if they want more powerful battery instead of weak one which is in a warmer place. Remember, that cooler place is able to keep the battery having enough voltage and ampere!
Table of Contents
RELATIONSHIP BETWEEN ELECTRICITY & TEMPERATURE
Ⅰ. Abstract & Introduction
What determines how much volt and current (ampere) is present in the salt water battery? Decide your independent variable.[our independent variable is = 'the temperature of the salt water']
We decided to change the temperature of the salt water and observe the difference in temp according to the time variation.
Ⅱ. Hypothesis
"If the temperature of water goes up, then the volt and the current from the salt water battery will also increase"Reason: When the temperature of the salt water increases, the electrons will be able to move in a faster speed, which will eventually give out more energy.
Ⅲ. Materials
1. 200ml of water2. 10g of salt (Sodium Nitrate; NaNO3)
3. One pair of electrode: 5cm * 5cm, copper & iron
4. 1 plastic cup
5. 1 beaker
6. 2 pieces of wires
5. Electronic balance
6. Heater
7. Thermometer
8. Ampere/ Voltameter
10. Metal stand and clamps.
Ⅳ. Procedure
1. Put 10g of salt into the plastic cup with 200 ml of water.
2. Stir the water until the salt is completely dissolved in the water.
3. Pour the salt solution into a beaker and set up the "battery."
4. Connect the wires from the electrodes to the ampere/voltameter.
5. Place the thermometer in the solution to observe the tempearture, and hold it with metal stand and clamps.
6. Change the temperature by using the heater
[By 5 degrees Celcius, ex) 30, 35, 40, 45, 50, 55, 60]
7. Record the observations, as the temperature increases.
[Look out for the change in both Volt and Ampere.]
8. Evaluate - draw tables, graphs, and idea to organize your observations.
Ⅴ. Graph & Table
Ⅵ. Evaluation
The data was surprisinngly, completely opposite to the result which we have expected during making hypothesis. We thought the voltage and ampere will increase if the temperature increases, but both voltage and ampere had rather been decreased. Even though we made some mistakes in keeping the position of the electrodes the same, but the result was okay. The strength of our method is that we actually can use the easiest method, which is just heating the beaker and waiting, in order to get a comparatively significant changes in voltage and ampere. However, the weakness of our method is that we are not able to observe the exact results because it is not able to measure the y values in exact x values. In words, the exact values of electricity are not able to be observed in exact temperature.
We can conclude from our results that if the temperature goes up, the voltage and ampere rather go down. We want to recommand the people who want to reproduce the battery should keep it in a cool place if they want more powerful battery instead of weak one which is in a warmer place. Remember, that cooler place is able to keep the battery having enough voltage and ampere!